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Field Study Using Speed Trailer With Red and Blue Lights Resulted in Over 50 Percent Speed Reduction in a Work Zone in the St. Louis Region During Daytime and Nighttime.

METHODOLOGY A field study was conducted to collect and analyze approximately four weeks of data from a work zone on I-270 westbound, spanning from the Lindbergh Boulevard interchange to Dunn Road…
Content type
Benefit
Date Posted
03/31/2023
Taxonomy (ARC-IT) Work Zone Management (MC06), Reduced Speed Zone Warning / Lane Closure (VS09)
Geolocation links
St. Louis, Missouri, United States

Expanding permanent DMS operations to include information on I-70 work zones has a benefit-to-cost ratio of 6.9:1.

FINDINGSBenefit-to-Cost EstimatesThe I-70 ITS deployment resulted in a cost of $198,530, a benefit of $407,694 and a benefit-to-cost ratio of 2.1:1. If the cost of existing ITS equipment (DMS system…
Content type
Benefit
Date Posted
02/23/2015
Taxonomy (ARC-IT) Traffic Information Dissemination (TM06), Integrated Decision Support and Demand Management (TM09), Work Zone Management (MC06), Traffic Incident Management System (TM08), Reduced Speed Zone Warning / Lane Closure (VS09)
Geolocation links
St. Louis, Missouri, United States

Deploy arterial travel time detection systems incrementally to allow time to identify issues and fine-tune performance.

LESSONS Chandler, AZ (Bluetooth deployment) This technology uses a wireless Bluetooth reader to communicate with in-vehicle devices programmed to pair with other Bluetooth devices. Matching…
Content type
Lesson
Date Posted
11/30/2014
Taxonomy (ARC-IT) Infrastructure-Based Traffic Surveillance (TM01), Integrated Decision Support and Demand Management (TM09)
Geolocation links
Chandler, Arizona, United States   |   St. Louis, Missouri, United States   |   United Kingdom

Variable advisory speed limit (VASL) systems encourage drivers to slow down gradually as they approach rural work zones.

The following recommendations were based on the case studies investigated. Use VASL systems to lower speeds and achieve better compliance with posted speed limits in areas without congestion in…
Content type
Lesson
Date Posted
04/29/2014
Taxonomy (ARC-IT) Variable Speed Limits (TM20), Reduced Speed Zone Warning / Lane Closure (VS09)
Geolocation links
St. Louis, Missouri, United States

In St. Louis County, Missouri, full closure of portions of I-64 for two years allowed for an accelerated construction schedule, saving taxpayers between $93 million and $187 million.

Findings By diverting 98,000 to 120,000 vehicles daily to alternative routes for two years, the impact costs over the normal operational state were $101.5 million. Had a partial closure system…
Content type
Benefit
Date Posted
01/02/2013
Taxonomy (ARC-IT) Traffic Information Dissemination (TM06), Integrated Decision Support and Demand Management (TM09), Personnel Device Maintenance (SU13), Personalized Traveler Information (TI02), Trip Planning and Payment (TI04), Broadcast Traveler Information (TI01)
Geolocation links
St. Louis, Missouri, United States

A Variable Speed Limit (VSL) system on the I-270/I-255 loop around St. Louis reduced the crash rate by 4.5 to 8 percent, due to more homogenous traffic speed in congested areas and slower traffic speed upstream.

METHODOLOGYPost-VSL deployment data from four segments on I-270 during peak periods was used to evaluate mobility outcomes of VSL. To understand operations under virtual pre-VSL operations, the…
Content type
Benefit
Date Posted
09/20/2011
Taxonomy (ARC-IT) Variable Speed Limits (TM20)
Geolocation links
St. Louis, Missouri, United States

The St. Louis Motorist Assist program had a benefit-cost ratio of 38.25:1, with annual secondary crashes lowered by 1,082 and annual congestion costs lowered by $1,130,000.

METHODOLOGYThe benefit-cost analysis used safety data from incidents that occurred from the years 2000-2008 on seven freeways in the metro St. Louis area. The analysis used data that law enforcement…
Content type
Benefit
Date Posted
04/26/2011
Taxonomy (ARC-IT) Roadway Service Patrols (PS08)
Geolocation links
St. Louis, Missouri, United States

An Arterial Service Patrol deployed during the re-construction of I-64 in St. Louis had a benefit-cost ratio of 8.3:1, lowered secondary crashes by 183 per year, and reduced annual congestion costs by $1,034,000.

METHODOLOGYThe evaluation incorporated actual incident data, Average Comprehensive Costs from the National Safety Council, fuel costs from the Missouri Department of Natural Resources for the 2008…
Content type
Benefit
Date Posted
04/26/2011
Taxonomy (ARC-IT) Roadway Service Patrols (PS08)
Geolocation links
St. Louis, Missouri, United States
ITS Deployment Evaluation

INTELLIGENT TRANSPORTATION SYSTEMS JOINT PROGRAM OFFICE

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Washington, DC 20590

its.dot.gov

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U.S. Department of Transportation Office of the Assistant Secretary for Research and Technology (OST-R)
 
 
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